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        <title>RecordRTC Merging WebM/WAV into mp4 using ffmpeg-asm.js</title>
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            <header style="text-align: center;">
                <h1>
                    <a href="https://www.webrtc-experiment.com/RecordRTC/">RecordRTC</a> Merging WebM/WAV into mp4 using <a href="http://bgrins.github.io/videoconverter.js/">ffmpeg-asm.js</a>!
                </h1>
                <p>
                    <a href="https://www.webrtc-experiment.com/ffmpeg/">HOME</a>
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                    <a href="http://www.MuazKhan.com/" target="_blank">Muaz Khan</a>
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            <div class="github-stargazers"></div>

            <section class="experiment">
                <h2 class="header">Logs</h2>
                <ol id="logs-preview">
                    <li>
                        <a href="https://www.webrtc-experiment.com/RecordRTC/">RecordRTC</a> experiment converting Merging WebM/WAV into mp4 inside the browser!
                    </li>

                    <li>
                        <strong>ffmpeg-asm.js</strong> is integrated with <a href="https://www.webrtc-experiment.com/RecordRTC/">RecordRTC</a> by <strong>Gregory McGee</strong>!
                    </li>
                </ol>
            </section>

            <section class="experiment">
                <h2 class="header">Record audio/video and convert/merge into "mp4"!</h2>

                <div class="inner">
                    <button id="record-video">Record</button>
                    <button id="stop-recording-video" disabled>Stop</button>
                    <br>
                    <video id="video-preview" controls muted></video>
                    <br>
                </div>
            </section>
            <script>
                var recordVideo, recordAudio;
                var videoPreview = document.getElementById('video-preview');
                var inner = document.querySelector('.inner');
                var videoFile = !!navigator.mozGetUserMedia ? 'video.gif' : 'video.webm';

                var isFirefox = !!navigator.mozGetUserMedia;

                document.querySelector('#record-video').onclick = function() {
                    this.disabled = true;
                    navigator.getUserMedia({
                            audio: true,
                            video: true
                        }, function(stream) {
                            videoPreview.srcObject = stream;
                            videoPreview.play();

                            recordAudio = RecordRTC(stream, {
                                type: isFirefox ? 'video' : 'audio',
                                recorderType: isFirefox ? MediaStreamRecorder : StereoAudioRecorder // force WebAudio for all browsers even for Firefox/MS-Edge
                            });

                            // todo: Firefox supports MediaRecorder API
                            // however it will record both audio/video tracks into single WebM
                            // Need to construct a MediaStream that is having no audio tracks
                            recordVideo = RecordRTC(stream, {
                                type: videoFile.indexOf('gif') == -1 ? 'video' : 'gif',
                                recorderType: isFirefox ? MediaStreamRecorder : WhammyRecorder
                            });

                            if(isFirefox) {
                                recordAudio.startRecording();
                                return;
                            }

                            recordVideo.initRecorder(function() {
                                recordAudio.initRecorder(function() {
                                    recordVideo.startRecording();
                                    recordAudio.startRecording();
                                });
                            });

                        }, function(error) { throw error;});
                    document.querySelector('#stop-recording-video').disabled = false;
                };

                document.querySelector('#stop-recording-video').onclick = function() {
                    this.disabled = true;

                    recordAudio.stopRecording(function() {

                        if(isFirefox) {
                            convertStreams(recordAudio.blob, recordAudio.blob);

                            log('<a href="'+ workerPath +'" download="ffmpeg-asm.js">ffmpeg-asm.js</a> file download started. It is about 18MB in size; please be patient!');
                            return;
                        }

                        recordVideo.stopRecording(function() {
                            convertStreams(recordVideo.blob, recordAudio.blob);

                            log('<a href="'+ workerPath +'" download="ffmpeg-asm.js">ffmpeg-asm.js</a> file download started. It is about 18MB in size; please be patient!');
                        });
                    });
                };

                var workerPath = 'https://archive.org/download/ffmpeg_asm/ffmpeg_asm.js';
				if(document.domain == 'localhost') {
					workerPath = location.href.replace(location.href.split('/').pop(), '') + 'ffmpeg_asm.js';
				}

                function processInWebWorker() {
                    var blob = URL.createObjectURL(new Blob(['importScripts("' + workerPath + '");var now = Date.now;function print(text) {postMessage({"type" : "stdout","data" : text});};onmessage = function(event) {var message = event.data;if (message.type === "command") {var Module = {print: print,printErr: print,files: message.files || [],arguments: message.arguments || [],TOTAL_MEMORY: message.TOTAL_MEMORY || false};postMessage({"type" : "start","data" : Module.arguments.join(" ")});postMessage({"type" : "stdout","data" : "Received command: " +Module.arguments.join(" ") +((Module.TOTAL_MEMORY) ? ".  Processing with " + Module.TOTAL_MEMORY + " bits." : "")});var time = now();var result = ffmpeg_run(Module);var totalTime = now() - time;postMessage({"type" : "stdout","data" : "Finished processing (took " + totalTime + "ms)"});postMessage({"type" : "done","data" : result,"time" : totalTime});}};postMessage({"type" : "ready"});'], {
                        type: 'application/javascript'
                    }));

                    var worker = new Worker(blob);
                    URL.revokeObjectURL(blob);
                    return worker;
                }

                var worker;

                function convertStreams(videoBlob, audioBlob) {
                    var vab;
                    var aab;
                    var buffersReady;
                    var workerReady;
                    var posted = false;

                    var fileReader1 = new FileReader();
                    fileReader1.onload = function() {
                        vab = this.result;

                        if (aab) buffersReady = true;

                        if (buffersReady && workerReady && !posted) postMessage();
                    };
                    var fileReader2 = new FileReader();
                    fileReader2.onload = function() {
                        aab = this.result;

                        if (vab) buffersReady = true;

                        if (buffersReady && workerReady && !posted) postMessage();
                    };

                    fileReader1.readAsArrayBuffer(videoBlob);
                    fileReader2.readAsArrayBuffer(audioBlob);

                    if (!worker) {
                        worker = processInWebWorker();
                    }

                    worker.onmessage = function(event) {
                        var message = event.data;
                        if (message.type == "ready") {
                            log('<a href="'+ workerPath +'" download="ffmpeg-asm.js">ffmpeg-asm.js</a> file has been loaded.');
                            workerReady = true;
                            if (buffersReady)
                                postMessage();
                        } else if (message.type == "stdout") {
                            log(message.data);
                        } else if (message.type == "start") {
                            log('<a href="'+ workerPath +'" download="ffmpeg-asm.js">ffmpeg-asm.js</a> file received ffmpeg command.');
                        } else if (message.type == "done") {
                            log(JSON.stringify(message));

                            var result = message.data[0];
                            log(JSON.stringify(result));

                            var blob = new Blob([result.data], {
                                type: 'video/mp4'
                            });

                            log(JSON.stringify(blob));

                            PostBlob(blob);
                        }
                    };
                    var postMessage = function() {
                        posted = true;

                        if(isFirefox) {
                            worker.postMessage({
                                type: 'command',
                                arguments: [
                                    '-i', videoFile,
                                    '-c:v', 'mpeg4',
                                    '-c:a', 'vorbis',
                                    '-b:v', '6400k',
                                    '-b:a', '4800k',
                                    '-strict', 'experimental', 'output.mp4'
                                ],
                                files: [
                                    {
                                        data: new Uint8Array(vab),
                                        name: videoFile
                                    }
                                ]
                            });
                            return;
                        }

                        worker.postMessage({
                            type: 'command',
                            arguments: [
                                '-i', videoFile,
                                '-i', 'audio.wav',
                                '-c:v', 'mpeg4',
                                '-c:a', 'vorbis',
                                '-b:v', '6400k',
                                '-b:a', '4800k',
                                '-strict', 'experimental', 'output.mp4'
                            ],
                            files: [
                                {
                                    data: new Uint8Array(vab),
                                    name: videoFile
                                },
                                {
                                    data: new Uint8Array(aab),
                                    name: "audio.wav"
                                }
                            ]
                        });
                    };
                }

                function PostBlob(blob) {
                    var video = document.createElement('video');
                    video.controls = true;

                    var source = document.createElement('source');
                    source.src = URL.createObjectURL(blob);
                    source.type = 'video/mp4; codecs=mpeg4';
                    video.appendChild(source);

                    video.download = 'Play mp4 in VLC Player.mp4';

                    inner.appendChild(document.createElement('hr'));
                    var h2 = document.createElement('h2');
                    h2.innerHTML = '<a href="' + source.src + '" target="_blank" download="Play mp4 in VLC Player.mp4" style="font-size:200%;color:red;">Download Converted mp4 and play in VLC player!</a>';
                    inner.appendChild(h2);
                    h2.style.display = 'block';
                    inner.appendChild(video);

                    video.tabIndex = 0;
                    video.focus();
                    video.play();

                    document.querySelector('#record-video').disabled = false;
                }

                var logsPreview = document.getElementById('logs-preview');

                function log(message) {
                    var li = document.createElement('li');
                    li.innerHTML = message;
                    logsPreview.appendChild(li);

                    li.tabIndex = 0;
                    li.focus();
                }

                window.onbeforeunload = function() {
                    document.querySelector('#record-video').disabled = false;
                };
            </script>

            <section class="experiment own-widgets">
                <h2 class="header" id="updates" style="color: red; padding-bottom: .1em;"><a href="https://github.com/muaz-khan/Ffmpeg.js/issues" target="_blank">Ffmpeg.js Issues</a>
                </h2>
                <div id="github-issues"></div>
            </section>

            <section class="experiment">
                <h2 class="header" id="feedback">Feedback</h2>
                <div>
                    <textarea id="message" style="border: 1px solid rgb(189, 189, 189); height: 8em; margin: .2em; outline: none; resize: vertical; width: 98%;" placeholder="Have any message? Suggestions or something went wrong?"></textarea>
                </div>
                <button id="send-message" style="font-size: 1em;">Send Message</button><small style="margin-left: 1em;">Enter your email too; if you want "direct" reply!</small>
            </section>


            <section class="experiment">
                <h2 class="header">Using ffmpeg-asm.js...</h2>
                <ol>
                    <li>
                        WebM can be converted in mp4.
                    </li>
                    <li>
                        WAV can be converted in ogg or mp3 (AAC/Vorbis).
                    </li>
                    <li>
                        WAV can be merged in mp4.
                    </li>
                </ol>
                <p style="margin-top: 0;">
                    If WAV or WebM is 5MB in size; ogg, mp3 or mp4 will be 700kb!
                </p>
            </section>

            <section class="experiment">
                <p style="margin-top: 0;">
                    Ffmpeg.js is MIT licensed on Github! <a href="https://github.com/muaz-khan/Ffmpeg.js" target="_blank">Documentation</a>
                </p>
            </section>

            <section class="experiment own-widgets latest-commits">
                <h2 class="header" id="updates" style="color: red; padding-bottom: .1em;"><a href="https://github.com/muaz-khan/Ffmpeg.js/commits/master" target="_blank">Latest Updates</a></h2>
                <div id="github-commits"></div>
            </section>
        </article>

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